"Or else, let's go back first? This seems to be a game, grab 15 points? But it seems not so easy to crack. After all, we are playing with people... If we delay a little, we will be blocked here. ☆→ Go back and prepare well, study how to play, come again tomorrow night?" Lin Qiuran suggested.

The people next to him nodded in agreement. The world is so powerful that General Liu, the Lord of the City, will definitely be stronger. If he is blocked in the house, there will probably be no future...

Xiao Ling waved his hand: "Not that anxious. Don't forget that he was distracted by playing chess while rushing here, not so fast." He looked at the nine tokens lined up on the jade plate, "Piao Rou should have guessed it right. I probably know how to play this thing. And... if you operate it well, you can not only open the door and enter, but maybe you can also use this thing to block the pursuers outside."

Li Dingyi, who was setting up a formation in front of the door and trying to delay the enemy with this, was a little unaware of whether he should continue to attack.

However, Xiao Ling's friends' eyes lit up. Since Xiao Ling said he knew, it was OK. They were all cheered up, let's see how Xiao Ling played this game.

Xiao Ling sorted out his thoughts a little and decisively started the third round of tests. He pressed four.

The opposite pressed five.

Frowning slightly, Xiao Ling continued to go down. After less than ten seconds of three or four steps, he failed and the jade plate was reset.

Friends looked at Xiao Ling: Didn’t you say it’s OK? Why did you fail?

"I will take action first, and there is only one strategy to ensure that the other seven will be defeated. So I can only pray that the guy on the other side does not master the only one. If he masters it, then it will be impossible to open this door if he doesn't kill him." Xiao Ling said calmly. This time he pressed six.

Among the friends, those with higher IQs, especially those who are good at playing games like Lin Qiuran, all frowned and thoughtful.

This game seems extremely complicated. If you think about it carefully, it seems not that complicated. The arrangement and combination are in sequence, and the sum is 15, so there are not many possible situations.

But the difficulty is that if you want 15, others will prevent you from getting 15. Adding the factor of interference and damage, it will become complicated and unpredictable.

There is only one strategy to ensure invincibility? How do you infer the many situations? Everyone is thinking hard, but unfortunately there is no result.

Xiao Ling pressed six times, but the opposite side still pressed five times.

Xiao Ling frowned even deeper.

Pressing five is the only right strategy. Although I can’t figure out anything else, through Xiao Ling’s face, my friends at least realized this.

But why is it five? Xiao Ling pressed four for the first time, and the second time was six for the second time. He pressed differently every time, just press five for the opposite side. My friends were all thinking about it...

Hey, wait, although he presses differently every time. Four, five, six, six, five, four seem to be equivalent... If you think so, the situation can be greatly reduced again, and it seems that there are only eight combinations? It is really unimaginable.

159, 168, 249, 258, 267, 348, 357, 456…

However, if you count the order of choices before and after, each of them has three first choices. Two types of responses will change a lot. And it is impossible to see at all, why is the second choice unbeaten?

The friends even took out blank talisman papers and concentrated on calculating them, but there was no decent conclusion for a while.

While thinking about it, a new round had already begun, and Xiao Ling pressed two this time.

It changed again... The friends were speechless.

For those who can barely understand it, Longmen Guan Sandao and Zhilin Wuxin could only stare at her eyes, her bald head was full of confusion. Things are actually very simple, but they have never learned the arrangement and combination, and it is really difficult to understand it.

When he was confused, the opponent pressed to respond, 7.

Sure enough, there is no blocking all possibilities! Yes, if all possibilities are blocked, there is no need to spend so many hands and feet to make props and arrange the scene. Xiao Ling was happy and immediately pressed five.

The opposite paused for a moment and selected eight when the time was about to end. He had to press it, otherwise Xiao Ling would have been fifteen.

In the next step, Xiao Ling chose four...

============

On the way to the General's Mansion at the intersection, General Liu and his entourage were yelling at home.

While rushing to the road, General Liu stopped from time to time and manipulated the Bagua carved by jade in his hand. The Bagua has all the Yin and Yang Taiji, Qian, Kan, Gen, Zhen, Xun, Li, Kun and Dui.

The general who stopped suddenly shouted, and his yellow face turned red: "Damn it! Damn it! Damn it!" He raised the jade gossip and almost broke it hard. But in the end he was still unwilling to bear it.

He hung the Jade Bagua back to his waist and roared repeatedly: "Hurry! Hurry! Hurry!"

On the road, I saw soldiers busy putting out fires or driving horses, and were scolded and called them to go back to the house to rescue them. Someone broke into the backyard and asked those who were greeted to continue to greet more people.

For a moment, shouts and shouts resounded through the night sky of Dasanguan. The original sound of putting out the fire and driving the horse was replaced by the sound of returning home to rescue the horse.

============

After Xiao Ling pressed the four, the jade plate no longer changed.

For one second, two seconds, there will be no change until the time of the set is exceeded.

In fact, even if the opponent makes a move, it doesn't make sense.

Xiao Ling holds two, four, and five three cards in his hand. In addition to the two, five, eight, and two, there are two strategies that can make up fifteen, two, four, and five, and six. Whether the other party fills nine or six, it can't stop him.

Let him take the lead, as long as he doesn’t choose five in the first step, he will win!

There was no response from the other side, and Xiao Ling slowly pressed the No. 6 plate.

"Boom..." A sound of Jijia turning. No, it wasn't Jijia turning, but the entire ground was vaguely rotating, with a slight tremor. The copper cast iron cast to the backyard was cast inlaid with steel nails, and thick doors engraved with talismans slowly opened, revealing the inner courtyard covered by night.

The friends couldn't help but look at Xiao Ling in admiration.

"Oh, I understand!" Two screams suddenly came, one left and one right.

Turning his head to see Lin Qiuran and Pu Rou.

Lin Qiuran: "It's true! It's true. As long as you start with two, four, six, and eight, you will lose if you don't choose five in the backhand."

Looking at the eyes that were focused on him, Lin Qiuran was proud and gestured a few obscure gestures. In line with the mouth shape, let everyone know that he compiled a mini program and verified Xiao Ling's step algorithm.

This is also considered... a stupid person has a stupid way, right? Xiao Ling was speechless.

Park Rou slapped him in the back of the head: "This is actually a tic toe game!" He glanced at Xiao Ling. This guy kept it in so long.

Xiao Ling rubbed his nose: "If you don't seize the opportunity to exercise you, how can you make progress?"

Park Rou: “…”

"Well, tic toe game?" The friends were still puzzled, and the other teammates also expressed confusion.

Pu Rou took out a blank piece of talisman paper and drew a tic toe on it with her thoughts.

The nine-frame tic toe, one-frame cross, one-frame circle, alternately, and finally the three forks or circles are connected to the front line.

"Oh, I've played it!" The little nun Zhilin said happily. The little monk Wuxin also nodded repeatedly.

Everyone was speechless. This little game that could be placed on a stone for half a day with just a random stroke. Who has never played it? But does this have anything to do with that...?

When he was puzzled, Pu Rou continued to express his thoughts and filled in the nine grids of the tic toe, from left to right, from top to bottom, in three rows, 294, 753, and 618.

This is... a nine-cup grid? A game that fills numbers and connects a line to a total of fifteen is also the basis of Sudoku games. No wonder Xiao Ling understood so quickly. Xiao Ling's friends also understood it vaguely.

Compared to the change of thoughts from everyone, Longmen Guan Sandao was more surprised: "Carry nine and walk one, three and seven on the left, two and four as shoulders, six and eight as feet, five in the middle, Hetu Luoshu? So that's it! So that's it! Playing tic-toe games with the nine grids of Luoshu, it turns out that there is such a magic hidden!"

Li Dingyi, Yin Sixi, An** are all fascinated by the way, like a sarcastic and grinding...

This is actually a question of equivalence. Three of nine digit cards are composed of fifteen. All the possibilities and arrangements are on the tic toe diagram. Therefore, how to complete the arrangement can be directly simplified into a tic toe game.

Whether in mathematics or computer programming, this often happens. In order to solve a difficult problem, my predecessors spent tons of draft paper or thousands of lines of code to vomit blood successfully. If you change your thinking, it may be a simple proof of two or three pages, or just a dozen or twenty lines of code, which will perfectly solve the problem.

It seems incredible that its core element is the transformation and replacement of this idea.

Of course, since people insist on saying that this is the magical part of the River Tu Luoshu, that’s it!

At that moment, Xiao Ling held the jade plate and took his friends and Longmenguan. While discussing, he walked into the backyard of the General's Mansion with his head held high.

Since this is essentially a tic-toe game, then the flipped brands are connected to fifteen, and eighteen to nine are like puzzles, which will connect the residence of a certain wife of a third-bedroom house into a front line, so that General Liu can choose one of the three rooms to move in at will.

Not only that, the arrangement is correct, and nine out of ten can also directly open the gate to the hinterland of Dongshan Mountain.

But before that... "Who? How dare you break into the General's Mansion at night!" A few squeal screams came suddenly.

At this time, everyone had just passed through the long narrow walkway behind the iron gate. The walkway was not completely closed. There were flowers and trees on both sides, blooming in colorful flowers. Although they could not see clearly, they could smell the fragrance.

As soon as I walked out of the walkway, I was facing a brightly lit courtyard. From the courtyard, several slender women holding single swords jumped out. It was probably the maid in the backyard, and the clothes were like those of me.
Chapter completed!